Insulator.



F. M. LOGKE.

- Mm esses.

wittorney.

P? on "A iii 1. iii.

UNITED PATENT OFF CE.

I FRED M. LOOKED, OF VICTOR, NEW YORK.

INSULATOR.

stereo.

flap-summation of Letters Patent.

Patented May '7, 1907.

{Application November 16, 1.903. Serial No. 181.361.

high potential insulators in which two or more porcelain or equivalent parts are fitted or nested one into the other and secured to gether at the joints by fusing", cementing or' equivalent means and are then fitted upon and secured to the center support so that the intermediate section extends below the top and center piece.

The object is to maintain a maximum insulation at or near the point of secureinent oft-he electric conductor to avoid puncturing by the electric current and at the same time to protect the supporting pin from current leakage without extending the center to the base of the iin, thereby saving; niatcrial and enabling t :0 center to be more easily and accurately formed. Other objects will appear hereafter. v

in the drawingsi igure l a vertical sectional view of my ill'lPiOVciBCl insul tor, and Fig. 2 is an inverted plan of tin. no.

Similar reference characters indicate cor responding parts in all the views.

As seen in the drawings, this insulator comprises a top section 1--, an intermediate section -2 and a center section 3-, all of which are formed of porcelain. or equivalent material and are fitted or nested one into the other and fused or otherwise secured by suitable filling in the joints to form a substantially integral insulator.

' The top section is concave convex or hell shape in cross section and'is preferably of greater diameter than the intern'iediate sec tion, being arranged with its convex face uppermostand provided with a grooved central boss 4- to which the electric conductor is attached while its lower face is-fornied with a central socket which receives the up. per end of the section 2 and. also receives a suitable material such as glaze which fills the intervening space and permanently se cures the contiguous parts together. This latter section 2' is preferably bell-shape and extends downwardly a considerable dis tance below the top 1-- or to a point be tween the lower face of the top -1 and-a supporting crossarin or equivalent device, as

-5,shown by dotted lines, Fig. 1, andalso extends beneath the lower end .of the.

center piece 3-,- the upper portion being abruptly swelled outwardly at -6"under the lower face of the section 1' .to form additional support therefor and also to carry .the static discharge away from the center pin. Although I have shown and. described this intermediate section as a single piece, it is apparent that it may be made up of two or more pieces nested one Within the other if desired. p

The inner or center section -3- is fitted and secured within the socket in the upper end of the intermediate section 2 and its lower end preferably terminates in a plane between the ends of bdth of the sections -1- and 2, or rather above their lower ends ,and is formed with an interior threaded socket 7 for receiving a supporting pin shown-by dotted lines Fig. 1.

It isnow seen that the greatest thickness of insulating material 18 interposed between the upper end of the pin S and points of securement of the electric conductor so as to I afford ample resistance agalnst shunting or short circuiting of the current fro n'the co'n ductor to thepin, and it is also apparent that the skirt of the depending portion of the sec-- ti on -2- which surrounds the pin 8 prevents the leakage of thecurrent from.

reaching said pin and by terniinatin thermotion -3-- a considerable d's'tancea bove the bottom of the section 2 and thereby increasing the air grep hetwee nthe base of the section 2- and pin -S the center scc tion is protected from moisture so that the current leakage cannot creep over its surface to the base of the pin. It will be seen that this air space between the pin and inner .face of the part 2* issubstantially uniform from top to bottoni, tl-rat is, the inner face of the part 2, is substantially parallel with the outer face of the pin 8. The object of this is to distribute the static discharge of the electric current evenly from the junctionof the parts 1 and 2 to the base of the part 2 thereby neutralizing its force and preventing serious injury to the pin.,

It will be observed that the center piece 3 is cylindrical and comparatively short,

which saves material and-enables it to be. more easlly and accuratelylori ed, and that.

the base of the reduced head 0 the section 2 flares abruptly from and above the lower end of the center-piece and terminates ina conipai a-tivel} long skirt, which extends some distance below the center-piece and has a11 -interyening air space extending from the.- ha-se otthje pin to t ie centernece The object' of thisis.t\\'ofold,first to keep the moisture anfiyfronrthe pin 'S, ant particularly from the junction of the pin with the cross-arm, and second, to afford a cons1d-' erahle air space as well as thickness of inszi lating material lretween the top face of" the section --1 and head of the pin -S to avoid as far as practicable the leakage of the electric current from the more or less moist surface of the cap-1 to the pin S.

Having th s described my invention what I-claiin and desire to secure by LettersPatent is r A porcelain insulator comprising a short cylindrical center piece having a threaded socket extending upwardly from the bottom, a hellshape skirt titted upon and secured to the top and" sides of the center piece and having portions thereof flaring ahruptl} from and above the bottom of the center piece; said skirt extending downwardly some distance below the lower end of the'center piece, inconihination with a cross arm-and pin, the latter entering said center piece, and 'said skirt extending from the centcr piece to the cross arm-around the pin and of greater interiordianieicr than said pin between the center piece and cross arm to all'ord considerable air space thereby preventing burning out of the base of the pin.

In witness whereof I have hereunto set my hand this 12th dayof November 1903.

' FRED M. LOCKE.

Witnesses:

C. 'A. MOORE, M. W. BURKE. 

